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Jimmy Fallon Just Staged An Epic 'Saved By The Bell' Reunion: Watch

When the 'Tonight Show' host pops a test, you know you're in a mess.

"Not many people know this, but I went to high school out here. I remember it like it was yesterday…"

So begins the greatest trick that Jimmy Fallon has ever pulled: an unannounced "Saved by the Bell" reunion. AND IT'S PERFECT:

Fallon, who is taping "The Tonight Show" in Los Angeles all week, unleashed the sketch to end all sketches when he traveled back in time to his teenage years at Bayside High — the home of babes, books and Belding.

It's the fulfillment of years of Fallon pledging to bring the "Saved by the Bell" cast together for a reunion, which has yielded some key cameos over the years, including Mark-Paul Gosselaar as Zack Morris on "Late Night with Jimmy Fallon" in 2009. Now, more than five years later, Fallon's assembled the rest of the group — well, most of the group, but we'll forgive a couple of oversights in this case because KELLY KAPOWSKI.

How exciting is this? It's so exciting! It's so exciting! It's so… scary